Temporal aggregations of bovine leukosis in multiple-case herds.
D000818:Animals; D001947:Breeding; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology* / Q000235:genetics; D008228:Lymphoma, Non-Hodgkin / Q000453:epidemiology / Q000235:genetics / Q000662:veterinary*; D010414:Pennsylvania; D013995:Time